#
# Copyright (2021) The Delta Lake Project Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

from typing import Dict, Optional, Union
from pyspark.sql.connect.column import Column

ExpressionOrColumn = Union[str, Column]
OptionalExpressionOrColumn = Optional[ExpressionOrColumn]
ColumnMapping = Dict[str, ExpressionOrColumn]
OptionalColumnMapping = Optional[ColumnMapping]
